I just realized that a field which is set to visibility "admin only", does not show in the "New Submission" email to myself. I am populating the data for that field with a content template, so there should be data in that field (and it shows in the post in WP). Is there a way to show that data for the hidden field in the email?
I guess it depends when the content template is generated? Is there any documentation what happens exactly when a content template is created? Where would I look in the code? Could I use a hook/filter?